mirror of
https://github.com/lwip-tcpip/lwip.git
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ac46e42aa2
... from http://git.savannah.gnu.org/cgit/lwip/lwip-contrib.git/ into contrib/ subdir, STABLE-2_1_0_RELEASE tag lwIP contrib is now officially frozen TODO: Fix build
217 lines
5.5 KiB
C#
217 lines
5.5 KiB
C#
using System;
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using System.Collections.Generic;
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using System.Text.RegularExpressions;
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using Lextm.SharpSnmpLib.Mib.Elements;
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using Lextm.SharpSnmpLib.Mib.Elements.Entities;
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using Lextm.SharpSnmpLib.Mib.Elements.Types;
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namespace Lextm.SharpSnmpLib.Mib
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{
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public static class MibTypesResolver
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{
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private static readonly Regex _namedOidPathRegex = new Regex(@"^(?<Name>[^\(]+)\((?<Value>\d+)\)$");
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private static readonly List<IMibResolver> _resolver = new List<IMibResolver>();
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private static readonly List<IModule> _cachedModules = new List<IModule>();
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public static void RegisterResolver(IMibResolver resolver)
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{
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if (resolver != null)
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{
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_resolver.Add(resolver);
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}
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}
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public static IModule ResolveModule(string moduleName)
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{
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// check if module is already cached
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foreach (MibModule cachedModule in _cachedModules)
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{
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if (cachedModule.Name == moduleName)
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{
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return cachedModule;
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}
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}
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foreach (IMibResolver resolver in _resolver)
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{
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IModule resolvedModule = resolver.Resolve(moduleName);
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if (resolvedModule != null)
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{
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ResolveTypes(resolvedModule);
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_cachedModules.Add(resolvedModule);
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return resolvedModule;
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}
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}
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return null;
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}
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public static void ResolveTypes(IModule module)
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{
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foreach (IEntity entity in module.Entities)
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{
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ITypeReferrer typeReferringEntity = entity as ITypeReferrer;
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if (typeReferringEntity != null)
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{
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CheckTypeReferrer(module, typeReferringEntity);
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}
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}
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if (!_cachedModules.Contains(module))
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{
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_cachedModules.Add(module);
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}
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}
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private static void CheckTypeReferrer(IModule module, ITypeReferrer typeReferringEntity)
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{
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TypeAssignment unknownType = typeReferringEntity.ReferredType as TypeAssignment;
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if (unknownType != null)
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{
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typeReferringEntity.ReferredType = ResolveType(module, unknownType);
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if (typeReferringEntity.ReferredType is TypeAssignment)
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{
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Console.WriteLine(String.Format("Could not resolve type '{0}' declared in module '{1}'", (typeReferringEntity.ReferredType as TypeAssignment).Type, typeReferringEntity.ReferredType.Module.Name));
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}
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}
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ITypeReferrer nextTypeReferringEntity = typeReferringEntity.ReferredType as ITypeReferrer;
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if (nextTypeReferringEntity != null)
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{
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CheckTypeReferrer(module, nextTypeReferringEntity);
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}
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}
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public static ITypeAssignment ResolveType(IModule module, TypeAssignment type)
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{
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ITypeAssignment result = ResolveDeclaration(module, type.Type) as ITypeAssignment;
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return (result != null) ? result : type;
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}
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public static IDeclaration ResolveDeclaration(IModule module, string name)
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{
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if ((module == null) || String.IsNullOrEmpty(name))
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{
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return null;
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}
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// check module internal types
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foreach (IDeclaration decl in module.Declarations)
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{
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if (decl.Name == name)
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{
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return decl;
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}
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}
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// check if type is imported
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if (module.Imports != null)
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{
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ImportsFrom imports = module.Imports.GetImportFromType(name);
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if (imports != null)
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{
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IModule importedModule = ResolveModule(imports.Module);
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if (importedModule != null)
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{
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return ResolveDeclaration(importedModule, name);
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}
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}
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}
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return null;
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}
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public static ObjectIdentifier ResolveOid(IEntity entity)
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{
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ObjectIdentifier result = new ObjectIdentifier();
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if (entity != null)
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{
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ResolveOid(entity, result);
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}
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return result;
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}
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private static void ResolveOid(IEntity entity, ObjectIdentifier result)
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{
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result.Prepend(entity.Name, entity.Value);
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// check parent
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if (!String.IsNullOrEmpty(entity.Parent))
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{
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string[] pathParts = entity.Parent.Split('.');
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uint value;
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// all parts except the first should have their value directly or indirectly with them
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if (pathParts.Length > 1)
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{
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for (int i=pathParts.Length-1; i>=1; i--)
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{
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if (uint.TryParse(pathParts[i], out value))
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{
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result.Prepend("", value);
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}
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else
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{
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Match m = _namedOidPathRegex.Match(pathParts[i]);
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if (m.Success)
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{
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result.Prepend(m.Groups["Name"].Value, uint.Parse(m.Groups["Value"].Value));
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}
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else
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{
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throw new MibException("Invalid OID path detected for entity '" + entity.Name + "' in module '" + entity.Module + "'!");
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}
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}
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}
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}
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// parse root part: either another entity or a standard root object
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if (IsOidRoot(pathParts[0], out value))
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{
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result.Prepend(pathParts[0], value);
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}
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else
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{
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// try to find entity inside this module
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if (entity.Module != null)
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{
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entity = ResolveDeclaration(entity.Module, pathParts[0]) as IEntity;
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if (entity != null)
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{
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ResolveOid(entity, result);
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}
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else
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{
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result.Prepend("", uint.MaxValue);
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}
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}
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else
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{
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result.Prepend("", uint.MaxValue);
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}
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}
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}
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}
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public static bool IsOidRoot(string name, out uint value)
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{
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value = uint.MaxValue;
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switch (name)
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{
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case "ccitt": value = 0; return true;
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case "iso": value = 1; return true;
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case "joint-iso-ccitt": value = 2; return true;
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}
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return false;
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}
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}
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}
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